Update sub-task in WP 1 from LfL_2014

Screening of wheat cross material and breeding lines in respect of susceptibility for bunt diseases an freshly infested and ecologically farmed fields

Robert Bauer, Benno Voit, Berta Killermann
Bayerische Landesanstalt für Landwirtschaft (LfL)

Field trial 2013/2014 (first growing year)

Weed control was carried out 5 times by hand. Harvesting was done by hand, i.e. the plants per row were cut, harvested, sacked and stored after drying. Infested plants per row were counted and taken out. From the total number of ears per row the percentage of infected ears was determined. The number of spores per kernel per line was analyzed by threshing the remaining plants by hand and by infecting them with the threshed infected ears. The results are shown in Figure 1 and Figure 2

Fig_1

Figure 1.Percentage of infected ears in relation to variety/breeding line

Fig_2

Figure 2. Number of spores per kernel

Field trial 2014/2015 (second growing year)

The varieties and breeding lines provided by Hermann Bürstmeyerin 2013 were sown on October 29, 2014 at one site, two replications with 10 m row length and 25 cm row spacing by a hand-drawn sowing machine. For sowing the harvested material of 2014 was used. Despite the late sowing date the sprouting was satisfying because of the good weather conditions. Complete sprouting of all rows was observed on November 20. Soil samples for determination of the spore potential in soil were taken on the sowing date. With the analyzed amount of 1200 spores per 10 g soil on average an infestation can be expected. The further stand development was good. The conditions for a dwarf infestation are by all means favorable since the soil is not yet frozen and from the end of December to mid of January the field trials have been snow covered. 

Field days 2014

June 23rd, 2014

     On June 23rd, a group of the organic food association “Bioland Bavaria” came to visit our field trial in Wolfersdorf, near Freising (Upper Bavaria) to catch up on the actual results of our research activities on dwarf bunt of wheat. The group, the majority being organic farmers affected by common and/or dwarf bunt diseases, was very interested in possible practical measures (different crop rotation systems, susceptible varieties, biofumigation, stable manure, …) to be able to fight these diseases.
     The COBRA field trial based on a naturally infested field offered the possibility to demonstrate differences in susceptibility of wheat varieties against dwarf bunt of wheat. The farmers confirmed that the knowledge about the different susceptibility of varieties give a useful tool to deal with the bunt problems by growing less susceptible varieties.   

July 4th, 2014

On July 4th, during the field days for ecological farming of the Bavarian State Research Center of Agriculture, different excursions were organized for visitors to get an impression of the current research activities being conducted with respect to ecological farming. The group meeting at the dwarf bunt field trials in Wolfersdorf, near Freising (Upper Bavaria) consisted of researchers as well as farmers. During the discussion that followed the presentation of the field experiments, the importance of a combination of the appropriate cultivation management (“good agricultural practice”), the selection of tolerant or less susceptible varieties as well as breeding programs against bunt disease was emphasized. 

Pictures

All pictures below have been taken by Robert Bauer.

Oral Presentations 2014

Robert Bauer: “Susceptibility of winter wheat varieties to dwarf bunt of wheat”
LfL seminar at the Institute for Crop Science and Plant Breeding, Freising, Germany

Robert Bauer: “Susceptibility of winter wheat varieties to dwarf bunt of wheat”
65th Plant Breeders Conference in Gumpenstein, Austria

Proceedings are in press.

 

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